Halftone
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Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. "Halftone" can also
The first printed photo using a halftone in a Canadian periodical, October 30, 1869
A multicolor postcard by Jenny Nyström (1899) printed from hand-made halftone plates
This close-up of a halftone print shows that magenta on top of yellow appears as orange/red, and cyan on top of yellow appears as green.
Purple screens used in offset printing: Angles 90°, 105°, 165°
Jacob Christoph Le Blon
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Jacob Christoph Le Blon, or Jakob Christoffel Le Blon, was a painter and engraver from Frankfurt who invented a halftone color printing system with three and four copper dyes using an RYB color model,
4-colour mezzotint of Louis XV by Le Blon, 1739
Separate prints of four plates: indigo, yellow, carmine, and bistre from a halftone color engraving by Jacob Christoph Le Blon (1738) after a painting by Hyacinthe Rigaud of Cardinal Fleury.
Finding the right shade of skin tone, test No. 6, Print by Le Bon